Soldering gun



G. CALIRI SOLDERING GUN Nov. 25, 1958 2 Sheets-Sheet 1 Filed Feb. 25. 1957 T m WWW N F U u 0 M g a N W C 3 E G. CALIRI SOLDERING GUN 2 Sheets-Sheet 2 Nov. 25, 1958 Filed Feb. 25, 1957 mvqw mw m .m E

, 99k mm W w w 2 w w r 2,862,094 Patented Nov. 25, 1958 2,862,094 SOLDERING GUN :GregoryCalir-i, Lawrence, Mass.

Application February 25,1957, Serial No. 642,058 3.01am. o1. 219-26 This invention generally relates to novel concepts in the construction of soldering guns, particularly soldering guns of the electric type having coaxial electrodes em ploying a step-down type of transformer for energizing the electrodes.

The primary object of the'present invention is to provide a,sol derin g gun of the electric type having a single pole assembly with coaxial electrodes including a barrel assembly which is removable and interchangeable, so that the barrel assembly may be made as long as desired for reaching inaccessible areas or for other purposes ahich may be readily apparent.

A further object of the present .inventionis to provide an electric soldering iron, in accordance with the preceding objects, in which a removable tip assembly is proded Y etanother importantobject of .the present invention is to provide a construction in accordance with the pre-.

ceding objects in which the secondary coil is ,in the form.

of a strap havingaligned terminal end portions provided with coaxial apertures for receiving the electrodes.

Some of the advantages of the invention are its simpli'city of construction, .easeof interchangeability of parts, adaptation for its particular purposesfandits relatively inexpensive manufacturing cost.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a parthereof, wherein like numerals refer to like parts throughout, andin which:

Figure 1 is a side elevational view of the present invention with portions of the gun being omitted;

Figure 2 is a plan view of the construction of Figure 1;

Figure 3 is a longitudinal, vertical sectional view taken substantially upon a plane passing through the longitudinal center of the single pole assembly;

Figure 4 is a transverse, vertical sectional view taken substantially upon a plane passing along section line 44 of Figure 1;

Figure 5 is an exploded group perspective view of the barrel assembly; and

Figure 6 is a perspective view illustrating the secondary coiled strap.

Referring now specifically to the drawings, the numeral 10 generally designates the outline of a soldering gun housing containing a step-down transformer assembly 12 to which is operatively connected a coaxial electrode unit generally designated by the numeral 14 which projects outwardly from the housing as shown.

The transformer assembly 12 includes a coiled strap 16 forming a path for the secondary circuit of the step-down transformer and including a plurality of longitudinally elongated loops which are substantially oval shaped and provided with inwardly extending terminal end portions 18 and 20 which are disposed in alignment and in longi- I I 2 tudinally spaced relation. The .inner terminal .end 18 is provided with a relatively small, internally threaded aperture 22, while-the outer terminal end 20 is provided With. a relatively large, internally threaded aperture 24 which, is .in axial alignment with the aperture 22 in the terminal end 18.

The electrode ,assembly 14 includes an externally threaded adapter 26 having a polygonal inner end 28, with the adapter .26 being threaded through the terminal end 120, with the threaded portion thereof in .engagement with the internal threaded. aperture 24 and the headed end portion 28 abutting the inner surface of the terminal end 20. ,An elongated outer electrode 30 isprovided with an externally threaded .inner .end portion 32 which is disposed in alignment with the externally threaded adapter126-and connected thereto byan internally threade sleeve 34, whichanot only retains the ends .of the adapter and router electrode 30 in abutting relation, but also .clarnpinglyabuts :the .outer surface of the terminal end .20, thereby rigidly securing the elements together. An elongated, tubulartip 36 is provided with an externally threaded jinnerend portion 38 for screw threaded engagement with an internally threaded end portion 40 of theouter tubular electrode-3.0, and the tubular tip 36 is provided with substantially conical or pyramidal point 42 for engagement with work.

. An-inner .rodelectrode .44iis .disposed in the outer electrode .30. in spaced concentric relation thereto and is maintained in spaced relation by a tubular insulating sleeve .46. A :tuhular insulated sleeve 48 is disposed in the externally threadedadapter 26 for receiving an extension 49lof the'inner. electrode 44 which has a screw threaded portion 50 in screw threaded. engagement with the aperture 22 in .the terminal end '18.

The .outerend of ,the extension 49 .is provided with a conical socket for receiving the conical end 52 of the inner electrode 44. The outer end :ofthe'inner electrode 44 is provided with a substantially conical socket for receiving the conical end '54 .of the longitudinal extension 56 disposed in the tubular tip :36,.with ,the outerend of heextension 56 being generallyconical as designated by the numeral58 .forxreception'in the inner socketed end f the tubular. tip "36. i

.A featurecf the present invention is :that the tip 36, along ;with;the .extension 58 may .beeasily removed, as may the barrel ,oryouter electrode 3.0 and vinner electrode 44, along with the insulating sleeve 46, wherein a longer barrel or outer electrode 30 and inner electrode 44 may be connected to the connector sleeve 34 and the tip 36 then replaced, thus providing a soldering gun which may be readily adapted with various lengths of single pole assembly 14 so that it may be employed for reaching inaccessible areas or in any other way desired. The coaxial alignment of the apertures 22 and 24 and the terminal ends 18 and 20 of the secondary coil provides a simplicity of construction which enables the barrel assembly, including the inner and outer electrodes and the insulating sleeve, to be easily removed and replaced.

The bushing or adapter 26 may be of copper material, as may be the sleeve 34, electrodes 30 and 44, as well as the tip 36. The conical end portions provide adequate continuity of the electrical circuit and the secondary coil may be in the form of a continuous copperbar or strap having the central loop disposed in inclined relation whereby the primary 'coil and the laminations may be compactly arranged in relation thereto. The casing 12 may be of pistol grip shape of insulating material and provided with the usual trigger switch and work illuminating bulb.

The foregoing is considered as illustrative only of the principles of the invention, Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

1. A soldering gun comprising a coiled strap providing a secondary circuit of a transformer, said strap having terminal ends provided with coaxial spaced apertures, a tubular outer electrode having one end thereof secured to one end of said strap, a tubular head removably attached to the outer end of the outer electrode and forming a continuation thereof, a sectional rod-type inner electrode connected at one end to the other aperture in said strap, an insulating sleeve interposed between said electrodes with the other end engaging the head, said outer electrode including an extension on the inner end thereof, said extension being externally threaded and mounted in the aperture in said one end of the strap, and

a sleeve interconnecting said extension and the outer electrode thus permitting removal of the outer and inner electrode for replacement with a longer set of electrodes.

2. In a soldering gun construction, a single pole assembly including an inner and an outer electrode arranged in concentric spaced relation, said outer electrode having an externally threaded inner end, an insulating sleeve disposed between the electrodes, a removable tip including extensions of the inner and outer electrodes, an extension for the inner electrode connected to one end of a secondary coil, an externally threaded tubular extension for the outer electrode threadably connected to the other end of the secondary coil, an internally threaded sleeve mounted on the tubular extension with one end abutting the other end of the secondary coil for locking the tubular extension thereto, said sleeve extending beyond the free end of the tubular extension for threadedly receiving the externally threaded end of the outer electrode, said insulating sleeve extending through the tubular extension and abutting the one end of the secondary coil thereby insulating the extensions. 7

3. A soldering gun comprising a coiled strap forming a secondary coil of a transformer, said strap including a plurality of oval-shaped loops disposed with the loops being spiral and continuous, one end of the strap extending longitudinally from one end of the coil and terminating in a laterally extending end having a threaded aperture therein, the other end of the strap extending longitudinally of the coil beyond said one end of the strap and terminating in a laterally extending end having a threaded aperture, the threaded apertures in the ends of the strap being axially aligned and spaced with the aperture in said other end of the strap being larger in diameter than the aperture in said one end of the strap, an externally threaded tubular member threaded through the aperture in said other end, said tubular member having a headed end abutting the inner surface of the said other end, an internally threaded sleeve threaded on the tubular member with one end abutting the outer surface of said other end of the strap thereby rigidly mounting the tubular member and sleeve on said other end of the strap, the other end of the sleeve extending beyond the tubular member and forming an internally threaded socket, a rod member having an externally threaded end portion extending concentrically within the tubular member and threadedly engaged with the aperture in said one end of the strap, an insulating sleeve enclosing the rod member throughout its length with one end abutting the outer surface of said one end of the strap thereby insulating the tubular member from the rod member, an outer tubular electrode of the same diameter as the tubular member having an externally threaded end portion threadedly engaged with the socket formed by the internally threaded sleeve and abutting the end of the tubular member, an inner rod-like electrode disposed concentrically spaced within the outer electrode and longitudinally abutting the rod member, an insulating sleeve disposed between the outer and inner electrodes and abuttingly engaging the outer end of the insulating sleeve disposed between the tubular member and rod member, said outer electrode, internally threaded sleeve and tubular member being electrically connected with said other end of the strap, said inner electrode and rod member being electrically connected with said one end of the strap, and a tip detachably connected to the outer end of the outer electrode and including a separable extension of the inner electrode and completing an electric circuit between the terminal ends of the secondary coil strap, said threaded connection between the outer electrode and sleeve and detachable connection between the tip and outer electrode permitting removal of the outer and inner electrodes for replacement with a different length set of electrodes.

References Cited in the file of this patent UNITED STATES PATENTS 2,560,552 Caliri July 17, 1951 2,671,845 I Chromy Mar. 9, 1954 2,674,680 Caliri Apr. 6, 1954 

